What is 10 less then the product of 2 and a number?

To determine the product of 2 and a number, you would multiply 2 by the unknown number. So, if the unknown number is represented by 'x', the product would be 2x. Then, to find 10 less than this product, you would subtract 10 from 2x. Therefore, the expression for "10 less than the product of 2 and a number" would be 2x - 10.